Change the Background Color of List Items in SwiftUI When Tapped

Learn how to dynamically change the `background color` of items in a SwiftUI horizontal list upon tapping, making your UI more interactive and engaging.
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This video is based on the question https://stackoverflow.com/q/71339088/ asked by the user 'Maysam' ( https://stackoverflow.com/u/689779/ ) and on the answer https://stackoverflow.com/a/71339349/ provided by the user 'Yrb' ( https://stackoverflow.com/u/7129318/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Change the Background Color of List Items in SwiftUI When Tapped

Visual appeal and interactivity are crucial in app development, especially when designing user interfaces. One common requirement is to change the background color of items in a list when they are tapped. In this guide, we will learn how to achieve this in SwiftUI, particularly when dealing with a horizontal ScrollView of items.

The Problem

You may have a horizontal ScrollView containing various items, and upon tapping an item, you want to change its background color. Initially, you might think this is easy, but if you run into issues such as your clicks seemingly not working, don’t worry! It’s a common stumbling block.

The provided code snippet is a good starting point but doesn't successfully change the background color when the items are tapped. Let’s look into the code to understand what’s going wrong and how we can fix it.

The Original Code

Here’s an overview of the initial presentation of the HorizontalList component:

[[See Video to Reveal this Text or Code Snippet]]

While this code outlines a horizontal list, it doesn’t correctly register taps on the items due to a lack of adequate gesture recognition.

The Solution: Use .simultaneousGesture()

To resolve the issue of tap gestures, we need to utilize .simultaneousGesture. This SwiftUI modifier allows us to register tap gestures alongside the drag gestures that may be happening behind the scenes. Here’s how to implement it:

Revised Code

Here is the updated version of the HorizontalList component, including the necessary changes:

[[See Video to Reveal this Text or Code Snippet]]

Introducing ListItemView

In this version, we’ve added a dedicated ListItemView for better organization and functionality. Here's how it looks:

[[See Video to Reveal this Text or Code Snippet]]

Explanation of Key Changes

Use of simultaneousGesture(): This allows tap gestures to work even with drag gestures being present, enabling background color changes upon user interaction.

Item Identification: We’ve changed the iteration to use zip for pairing each item with its index, ensuring that the loop tracks items correctly.

Decoupling ListItemView: By creating a separate view for list items, the code maintains better readability and modularity.

Conclusion

With the adjustments made, your horizontal list items will now correctly change their background color when tapped, enhancing user experience. You can easily customize this further, such as adding animations or different colors. By incorporating better gesture handling and modular code structures, your SwiftUI applications will become more interactive and appealing.

Happy coding and enjoy developing interactive applications with SwiftUI!

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